I pretty much agree--even though I myself tend toward optimized builds.I actively dislike multiclass in 5e. I was initially going to ban it in my current campaign but one of my players wanted it so bad.
It's often used by people who focus more on character build than character concept. People who view building a character aa akin to building a deck in magic the gathering lookingfor optimized synergies.
I prefer when characters are defined more by their personality and choices than by the efficiency of their mechanics.
If you have a neat concept that isn't well represented by an existing class/subclass I would prefer to just homebrew something than use a multiclass kludge.
The problem with 5E multiclassing is that the resulting characters are horribly underpowered unless you optimize carefully or luck into a strong combo (which basically means "warlock + other Cha-based class"). If you're creating a concept which calls for a mix of class abilities, multiclassing is almost always the wrong way to go about it.
If I were in charge, multiclassing would work like 4E hybrid classes, where each class has a half-powered "multiclass" version, and you pick two and stick them together. If you just want to dabble in another class, that should be handled through feats.